Improvement in head-blocks



UNITED STATES PATENT OFFICE.

JoHN M. OOMINS, OF BoscAwEN, NEW HAMPSHIRE, ASSIGNOR T0 HnusELF ANDAUsTLN e. KIMBALL, or SAME PLACE.

IMPROVEMENT IN HEAD-BLCCKS.

Specification forming part of Letters Patent No. 122,228, dated December26, 1871.

, the head-block itself.

In the drawing, A is the head-block. a is the aforesaid bar, the samebeing provided with vertical racks b, which extend downward from the bara near the ends thereof. 0 are metal anglebars fastened to the side ofthe head-block opposite the racks b, which bear against the angle--bars. at is a horizontal shaft mounted in theprojecting parts of theangle-bars, and having pinions e situated within the plates 0, whichengage with the racks b. g is a ratchet on the shaft (1 outside one ofthe plates 0, and with said ratchet engages a spring-pawl, h, secured tothe adjacent plate a. By means of a lever applied to the shaft cl thelatter may be rotated so as to raise or lower the bar a to the extentrequisite to cause the latter to support the end of a crooked log whichcannot be supported by the head-block.

This arrangement is used in connection with adjustable dogs j k, theconstruction and operation of which I am aware are not new.

I claim as my invention--- The combination of the head block A, bar a,

racks b, angle-plates a, shaft d, and pinions e, as"

specified.

Witnesses:

OHAs. O. LUND, ALSTON G. COLBY.

JoHN M. GOMINS.

